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Batteries are 2200 mah lipos, sometimes I run them in parallel and gearing is stock, temps are usually over 80 degree C (about 170F) and up in about 10 mins the overheat protection comes on, trucks power is reduced and red light blinking, If i cool the truck it will run for another few mins and overheat again.

The summit is bone stock out of the box and the revo has slightly larger tires, same gearing i've had for 2 years

i would say gear down to the 23 pinion if you are already useing that then 19 to help with temps.

question whats your driving habit? hard accel and braking alot? that will increase temps fast or tires loosing traction then grabbing on and off alot at high speed, i know mine heats up fast when those things happen. any Hill climbing or going up hills alot?

I hope that dont happen to mine. I got my diffs shimmed, I used to front and back., got 100k diff fluid in there, I would like something a little heavier. All i need now is axle carriers, the stocks are getting sloppy.